Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.3 (4.7.3)
Qt Version: 4.7.4
Operating System: Linux 3.0.0-14-generic x86_64
Distribution: Ubuntu 11.10

-- Information about the crash:
Kmail2: editing an e-mail: I clicked on "Send" and Plasma crashed

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma-Desktop-Umgebung (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f5e916da7a0 (LWP 2777))]

Thread 4 (Thread 0x7f5e64a4f700 (LWP 2780)):
#0  0x00007f5e860611fd in __pthread_mutex_unlock_usercnt (mutex=<optimized out>, decr=<optimized out>) at pthread_mutex_unlock.c:52
#1  __pthread_mutex_unlock (mutex=0x7f5e60000fb8) at pthread_mutex_unlock.c:290
#2  0x00007f5e85551451 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f5e8e1b7f3e in QEventDispatcherGlib::processEvents (this=0x7f5e60000ec0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f5e8e18bcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f5e8e18bef7 in QEventLoop::exec (this=0x7f5e64a4edb0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f5e8e0a327f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007f5e8e16ecbf in QInotifyFileSystemWatcherEngine::run (this=0x21f5150) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f5e8e0a5d05 in QThreadPrivate::start (arg=0x21f5150) at thread/qthread_unix.cpp:331
#9  0x00007f5e8605defc in start_thread (arg=0x7f5e64a4f700) at pthread_create.c:304
#10 0x00007f5e90fd289d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f5e5ffff700 (LWP 2781)):
#0  0x00007f5e860611fd in __pthread_mutex_unlock_usercnt (mutex=<optimized out>, decr=<optimized out>) at pthread_mutex_unlock.c:52
#1  __pthread_mutex_unlock (mutex=0x229a6e8) at pthread_mutex_unlock.c:290
#2  0x00007f5e85551451 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f5e8e1b7f3e in QEventDispatcherGlib::processEvents (this=0x229ae70, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f5e8e18bcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f5e8e18bef7 in QEventLoop::exec (this=0x7f5e5fffedb0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f5e8e0a327f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007f5e8e16ecbf in QInotifyFileSystemWatcherEngine::run (this=0x1f9aa40) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f5e8e0a5d05 in QThreadPrivate::start (arg=0x1f9aa40) at thread/qthread_unix.cpp:331
#9  0x00007f5e8605defc in start_thread (arg=0x7f5e5ffff700) at pthread_create.c:304
#10 0x00007f5e90fd289d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f5e5a410700 (LWP 2787)):
#0  0x00007f5e90fc6773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f5e85550f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f5e85551792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f5e5aeee516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f5e855762b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f5e8605defc in start_thread (arg=0x7f5e5a410700) at pthread_create.c:304
#6  0x00007f5e90fd289d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f5e916da7a0 (LWP 2777)):
[KCrash Handler]
#6  isNull (this=0x0) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#7  operator! (this=0x0) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#8  TaskManager::TaskItem::task (this=0x406fdf0) at ../../../libs/taskmanager/taskitem.cpp:113
#9  0x00007f5e700e6112 in WindowTaskItem::publishIconGeometry (this=0x3671fd0) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:120
#10 0x00007f5e700f4b7c in AbstractTaskItem::timerEvent (this=0x3671fd0, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#11 0x00007f5e8e1a3789 in QObject::event (this=0x3671fd0, e=<optimized out>) at kernel/qobject.cpp:1181
#12 0x00007f5e8db5b89b in QGraphicsWidget::event (this=0x3671fd0, event=0x7fffcbf93ed0) at graphicsview/qgraphicswidget.cpp:1455
#13 0x00007f5e8d53d424 in notify_helper (e=0x7fffcbf93ed0, receiver=0x3671fd0, this=0x9ffbc0) at kernel/qapplication.cpp:4486
#14 QApplicationPrivate::notify_helper (this=0x9ffbc0, receiver=0x3671fd0, e=0x7fffcbf93ed0) at kernel/qapplication.cpp:4458
#15 0x00007f5e8d542291 in QApplication::notify (this=0x9f03f0, receiver=0x3671fd0, e=0x7fffcbf93ed0) at kernel/qapplication.cpp:4365
#16 0x00007f5e8ee3b126 in KApplication::notify (this=0x9f03f0, receiver=0x3671fd0, event=0x7fffcbf93ed0) at ../../kdeui/kernel/kapplication.cpp:311
#17 0x00007f5e8e18cafc in QCoreApplication::notifyInternal (this=0x9f03f0, receiver=0x3671fd0, event=0x7fffcbf93ed0) at kernel/qcoreapplication.cpp:787
#18 0x00007f5e8e1b9d62 in sendEvent (event=0x7fffcbf93ed0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#19 QTimerInfoList::activateTimers (this=0x9fdec0) at kernel/qeventdispatcher_unix.cpp:603
#20 0x00007f5e8e1b7514 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#21 0x00007f5e85550a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007f5e85551258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f5e85551429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f5e8e1b7ed6 in QEventDispatcherGlib::processEvents (this=0x97bf40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#25 0x00007f5e8d5e507e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#26 0x00007f5e8e18bcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#27 0x00007f5e8e18bef7 in QEventLoop::exec (this=0x7fffcbf94160, flags=...) at kernel/qeventloop.cpp:201
#28 0x00007f5e8e190789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#29 0x00007f5e912d11a3 in kdemain (argc=1, argv=0x7fffcbf94548) at ../../../../plasma/desktop/shell/main.cpp:120
#30 0x00007f5e90f1230d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fffcbf94548, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffcbf94538) at libc-start.c:226
#31 0x0000000000400671 in _start ()

Possible duplicates by query: bug 288383, bug 288343, bug 288295, bug 288262, bug 288260.

Reported using DrKonqi